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Which is the correct statement for the given acids?

1. Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
2. Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
3. Both are triprotic acids
4. Both are diprotic acids

Correct answer: Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid

Solution

Phosphinic acid (H3PO2) has only one replaceable hydrogen atom, making it monoprotic, while phosphonic acid (H3PO3) has two replaceable hydrogen atoms, making it diprotic.

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